Calcium is one of the major components in the structure of coral skeletons and shells of many marine animals including giant clams and snails. Magnesium is required to keep high concentrations of calcium available in aquarium water.
Aqua One Calcium and Magnesium is formulated to keep a balance of these two minerals in the marine aquarium.
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I have a fully automated 9ft reef aquarium. Majestic have always been good to me. They have the biggest range, they match all prices and give the best advice. - Anthony Care